i was having this conversation with my sister recently, who solely listens to korean and japanese pop music, but doesn't know any of the words and can't sing along.

i found this very strange; i personally can't not know the (perceptible) words to songs i really like, even if it's in another language. it takes a lyrics page online and a few extra listens to pick up the words but it's fine

i know the words to these well for example, despite them being in congolese and finnish respectively:
http://www.youtube.com/watch?v=wkF9ujJwCcw
(staff benda bilili - moto moindo)
http://www.youtube.com/watch?v=Vc5Jrr1YMjg
(tenhi - vastakaiun)

i did know a guy though who failed gcse german, but could sing along to any rammstein song